High-Q, high-power spin Hall nano-oscillators with thick NiFe layers enabled by SiC substrates
Abstract
Spin Hall nano-oscillators (SHNOs) are nanoscale microwave sources with potential applications in local spin excitation, neuromorphic computing, and oscillator-based Ising machines. Further improvements in output power and coherence are essential for these applications, and increasing the thickness of the ferromagnetic layer offers a promising route toward this goal. However, this comes at the cost of higher drive currents, which increase Joule heating and can degrade device performance. Here, we show that this bottleneck can be overcome by SiC substrates. By comparing otherwise identical W/NiFe nanoconstriction SHNOs on Al2O3, Si, and SiC, we find that the high thermal conductivity of SiC enables stable auto-oscillations in NiFe layers as thick as 10 nm, while the optimum performance occurs at 7 nm. The best SiC device reaches an average output power of 13.1 pW and a mean quality factor of Q = 23,000, representing the highest reported simultaneous output power and coherence for a single free-running SHNO. These results establish SiC and thermal substrate engineering as a route to thick-ferromagnet spintronic oscillators for coherent microwave generation in nanoscale devices.
Related
- Thermal stability and structural ordering of thick Co2MnAl films grown on MgO and Si substrates
- Reconfigurable field-free spin Hall nano-oscillators enabled by crystallographic anisotropy in epitaxial Co/Pt
- Heteroepitaxial Growth of PbSe on InP Substrates via Lattice-Matched III-V Buffer Layers
- Field-like Perturbation Enabled Six-state Readout in Triaxial α-Fe2O3|Pt Bi-layers
- Odd-even dichotomy in the waveforms of modified Emden oscillators of arbitrary integer power
BibTeX
@misc{khademi2026highq,
title = {{High-Q, high-power spin Hall nano-oscillators with thick NiFe layers enabled by SiC substrates}},
author = {Maha Khademi and Akash Kumar and Martina Ahlberg and Artem Litvinenko and Xiaotian Zhao and Saroj P. Dash and Johan Åkerman},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.35245},
eprint = {2610.35245},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.35245},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - High-Q, high-power spin Hall nano-oscillators with thick NiFe layers enabled by SiC substrates
AU - Maha Khademi
AU - Akash Kumar
AU - Martina Ahlberg
AU - Artem Litvinenko
AU - Xiaotian Zhao
AU - Saroj P. Dash
AU - Johan Åkerman
PY - 2026
DA - 2026/10/26
PB - arXiv
DO - 10.48550/arxiv.2610.35245
UR - https://arxiv.org/abs/2610.35245
AB - Spin Hall nano-oscillators (SHNOs) are nanoscale microwave sources with potential applications in local spin excitation, neuromorphic computing, and oscillator-based Ising machines. Further improvements in output power and coherence are essential for these applications, and increasing the thickness of the ferromagnetic layer offers a promising route toward this goal. However, this comes at the cost of higher drive currents, which increase Joule heating and can degrade device performance. Here, we show that this bottleneck can be overcome by SiC substrates. By comparing otherwise identical W/NiFe nanoconstriction SHNOs on Al2O3, Si, and SiC, we find that the high thermal conductivity of SiC enables stable auto-oscillations in NiFe layers as thick as 10 nm, while the optimum performance occurs at 7 nm. The best SiC device reaches an average output power of 13.1 pW and a mean quality factor of Q = 23,000, representing the highest reported simultaneous output power and coherence for a single free-running SHNO. These results establish SiC and thermal substrate engineering as a route to thick-ferromagnet spintronic oscillators for coherent microwave generation in nanoscale devices.
ER -